Run. Think. Shoot. Live. Source.
Black Mesa is the Half-Life 2 total conversion of the original Half-Life game. Utilizing the Source engine and its endless array of possibilities and powers, Black Mesa will throw you into the world that started the Half-Life continuum and introduced Gordon Freeman to the world as a gun-toting, bullet-dodging Ph.D. in Theoretical Physics.

This one looks really nice!
The only thing that would be changeable is to make the tentacles red, like others suggested.
Don't change the eyes, all black eyes look just like those ugle stereotypical alien eyes. Keep them like this.

God I hated this thing in my youth lol.Great recreation.I've been playing the original half life lately, and the more i do I realize just how much more immersive it could've been with a little technology.And now it seems like my dream is coming true.Good work and keep on keepin on